<template>
	<view class="chatInterface">
		<view class="scroll-view">
			<view class="all-history-loaded">
				{{allHistoryLoaded ? '已经没有更多的历史消息' : '下拉获取历史消息'}}
			</view>
			<!--已经收到的消息-->
			<view v-for="(message,index) in messages" :key="message.messageId">

<!--				时间显示，类似于微信，隔5分钟不发言，才显示时间-->
				<view class="time-lag">
					{{renderMessageDate(message, index)}}
				</view>

				<view class="message-item" :class="{'self' : message.senderId == (currentUser && currentUser.uuid)}">
					<view class="avatar"
						  v-if="message.senderId != (currentUser && currentUser.uuid)">
						<image :src="friend.avatar"></image>
					</view>
					<view class="avatar" v-else>
						<image :src="currentUser.avatar"></image>
					</view>
					<view class="content">
						<b class="pending" v-if="message.status == 'sending'"></b>
						<b class="send-fail" v-if="message.status == 'fail'"></b>
						<view v-html="renderTextMessage(message)"></view>
						<image class="image-content" v-if="message.type == 'image'" :src="message.payload.url" :data-url="message.payload.url" @click="showImageFullScreen" mode="widthFix"></image>
						<view class="video-snapshot"  v-if="message.type == 'video'" :data-url="message.payload.video.url" @click="playVideo">
							<image :src="message.payload.thumbnail.url" mode="aspectFit"></image>
							<view class="video-play-icon"></view>
						</view>
						<GoEasyAudioPlayer v-if="message.type =='audio'" :src="message.payload.url" :duration="message.payload.duration" />
						<view class="custom-message" v-if="message.type == 'order'">
							<view class="title">
								<image src="../../../static/images/dingdan.png"></image>
								<text>自定义消息</text>
							</view>
							<view class="custom-message-item">编号: {{message.payload.number}}</view>
							<view class="custom-message-item">商品: {{message.payload.goods}}</view>
							<view class="custom-message-item">金额: {{message.payload.price}}</view>
						</view>
					</view>
				</view>
			</view>
		</view>
		<view class="action-box" v-if="!video.visible">
			<view class="action-top">
				<view :class="[audio.visible ? 'record-icon record-open':'record-icon']" @click="switchAudioKeyboard"></view>
				<view class="record-input" @touchstart="onRecordStart" @touchend="onRecordEnd" v-if="audio.visible" >{{audio.recording ? '松开发送' : '按住录音'}}</view>
				<view class="message-input" v-else>
					<input type="text" placeholder="发送消息" v-model="content" @focus="messageInputFocusin">
				</view>
				<view class="file-icon emoji-icon" @click="showEmoji"></view>
				<view class="file-icon more-icon" @click="showMore"></view>
				<span class="send-message-btn" @click="sendTextMessage">发送</span>
			</view>

<!--			展示表情列表-->
			<view class="action-bottom" v-if="emoji.show" style="justify-content: space-around">
				<image class="emoji-item" v-for="(emojiItem, emojiKey, index) in emoji.map" :key="index" :src="emoji.url + emojiItem" @click="selectEmoji(emojiKey)"></image>
			</view>
<!--			更多-->
			<view class="action-bottom" v-if="more.show">
				<view class="more-item" @click="sendImage">
					<image src="../../../static/images/tupian.png"></image>
					<text>图片</text>
				</view>
				<view class="more-item" @click="sendVideo">
					<image src="../../../static/images/shipin.png"></image>
					<text>视频</text>
				</view>
				<view class="more-item" @click="showCustomMessageForm">
					<image src="../../../static/images/zidingyi.png"></image>
					<text>自定义消息</text>
				</view>
			</view>
		</view>
		<view class="record-loading" v-if="audio.recording"></view>
		<video :src="video.url" v-if="video.visible" id="videoPlayer" autoplay="true" @fullscreenchange="onVideoFullScreenChange"  @play="onVideoPlayStart"></video>
	</view>
</template>

<script>
	import GoEasyAudioPlayer from "../../../components/GoEasyAudioPlayer/GoEasyAudioPlayer";
	import EmojiDecoder from "../../../lib/EmojiDecoder";
	const recorderManager = uni.getRecorderManager();

	export default {
		name: "privateChat",
		components : {
			GoEasyAudioPlayer,
		},
		data() {
			let emojiUrl = 'https://imgcache.qq.com/open/qcloud/tim/assets/emoji/';
			let emojiMap = {
				'[么么哒]': 'emoji_3@2x.png',
				'[乒乓]': 'emoji_4@2x.png',
				'[便便]': 'emoji_5@2x.png',
				'[信封]': 'emoji_6@2x.png',
				'[偷笑]': 'emoji_7@2x.png',
				'[傲慢]': 'emoji_8@2x.png'
			};

			return {
				//聊天文本框
				content: '',
				friend: null,
				currentUser: null,
				//已经接收到的消息
				messages: [],
				//已经加载完所有历史消息
				allHistoryLoaded: false,

				//定义表情列表
				emoji : {
					url : emojiUrl,
					map : emojiMap,
                    show: false,
                    decoder:  new EmojiDecoder(emojiUrl, emojiMap),
				},
				more : {//更多按钮
					show : false
				},
				audio : {
					//语音录音中
					recording : false,
					//录音按钮展示
					visible : false
				},
				video : {
					visible : false,
					url : '',
					context : null
				},
				imService : null
			}
		},
		onReady () {
			this.video.context = uni.createVideoContext('videoPlayer');
		},
		onShow () {
			this.more.show = false;
			this.emoji.show = false;
		},
		onLoad(options) {
			this.imService = getApp().globalData.imService;

			if(!this.imService) return;
			this.currentUser = this.imService.currentUser;

			//对话数据
            let friendId = options.to;

            //从服务器获取最新的好友信息
            this.friend = this.imService.findFriendById(friendId);

			this.messages = this.imService.getPrivateMessages(friendId);
			uni.setNavigationBarTitle({
				title : this.friend.name
			});

			this.initialListeners();


			//每次进入聊天页面，总是滚动到底部
			this.scrollToBottom();

            // 录音监听器
            this.initRecorderListeners();

			//收到的消息设置为已读
			if(this.messages.length !=0){
				this.markPrivateMessageAsRead(friendId);
			}


		},
		onPullDownRefresh: function(e) {
			this.loadMoreHistoryMessage();
		},
		onUnload() {
			//退出聊天页面之前，清空页面传入的监听器
			if(this.imService) {
				this.imService.onNewPrivateMessageReceive =  (friendId, message)=> {};
			}
		},
		methods: {

            //渲染文本消息，如果包含表情，替换为图片
		    //todo:本不需要该方法，可以在标签里完成，但小程序有兼容性问题，被迫这样实现
            renderTextMessage(message) {
                if (message.type === 'text') {
                    return '<span class="text-content">' + this.emoji.decoder.decode(message.payload.text) + '</span>'
                }
                return ''
            },

            //像微信那样显示时间，如果有几分钟没发消息了，才显示时间
            //todo:本不需要该方法，可以在标签里完成，但小程序有兼容性问题，被迫这样实现
            renderMessageDate(message, index) {
                if (index === 0) {
                    return this.formatDate(message.timestamp)
                } else {
                    if (message.timestamp - this.messages[index - 1].timestamp > 5 * 60 * 1000) {
                        return this.formatDate(message.timestamp)
                    }
                }
                return ''
            },


			initialListeners () {
				//传入监听器，收到一条私聊消息总是滚到到页面底部
				this.imService.onNewPrivateMessageReceive =  (friendId, message)=> {
					if (friendId == this.friend.uuid) {
						this.markPrivateMessageAsRead(friendId);
						//收到新消息，是滚动到最底部
						this.scrollToBottom()
					}
				};

			},
			initRecorderListeners(){
				// 监听录音开始
				recorderManager.onStart(() => {
					this.audio.recording = true;
				});

				//录音结束后，发送
				recorderManager.onStop((res) => {
					this.audio.recording = false;
					let audioMessage = this.im.createAudioMessage({
						to : {
							id : this.friend.uuid,
							type : this.GoEasyIM.SCENE.PRIVATE,
							data : {name:this.friend.name, avatar:this.friend.avatar}
						},
						file: res,
						onProgress :function (progress) {
							console.log(progress)
						}
					});
					this.imService.sendMessage(audioMessage)
				});

				// 监听录音报错
				recorderManager.onError(function(res){
					console.log("录音报错：",res);
				})
			},
			sendTextMessage() {//发送消息
				if (this.content.trim() != '') {
					let textMessage = this.im.createTextMessage({
						text: this.content,
						to : {
							id : this.friend.uuid,
							type : this.GoEasyIM.SCENE.PRIVATE,
							data : {name:this.friend.name, avatar:this.friend.avatar}
						}
					});
					this.imService.sendMessage(textMessage);
				}
				this.scrollToBottom();
				this.content = "";
			},
			loadMoreHistoryMessage() {//历史消息
				let lastMessageTimeStamp = Date.now();
				let lastMessage = this.messages[0];
				if (lastMessage) {
					lastMessageTimeStamp = lastMessage.timestamp;
				}
                let currentLength = this.messages.length;
				let promise = this.imService.loadPrivateHistoryMessage(this.friend.uuid, lastMessageTimeStamp);
				promise.then(messages => {
					if (messages.length == currentLength) {
						this.allHistoryLoaded = true
					}
					this.messages = messages;
					uni.stopPullDownRefresh();
				}).catch(e => {
                    console.log(e)
                    uni.stopPullDownRefresh();
                })
			},
			//语音录制按钮和键盘输入的切换
			switchAudioKeyboard() {
				this.audio.visible = !this.audio.visible;
				if(uni.authorize){
					uni.authorize({
						scope : 'scope.record'
					})
				}
			},
			onRecordStart () {
				try{
					recorderManager.start();
				}catch(e){
					uni.showModal({
						title: '录音错误',
						content : '请在app和小程序端体验录音，Uni官方明确H5不支持getRecorderManager, 详情查看Uni官方文档'
					});
				}
			},
			onRecordEnd () {
				try{
					recorderManager.stop();
				}catch(e){
					console.log(e)
				}
			},
			sendVideo () {//发送文件
				uni.chooseVideo({
					success : (res) => {
						let videoMessage = this.im.createVideoMessage({
							to : {
								id : this.friend.uuid,
								type : this.GoEasyIM.SCENE.PRIVATE,
								data : {name:this.friend.name, avatar:this.friend.avatar}
							},
							file: res,
							onProgress :function (progress) {
								console.log(progress)
							}
						});
						this.imService.sendMessage(videoMessage)
					}
				})
			},
			sendImage() {
				uni.chooseImage({
					count :1,
					success :(res) => {
						let imageMessage = this.im.createImageMessage({
							to : {
								id : this.friend.uuid,
								type : this.GoEasyIM.SCENE.PRIVATE,
								data : {name:this.friend.name, avatar:this.friend.avatar}
							},
							file: res,
							onProgress :function (progress) {
								console.log(progress)
							}
						});
						this.imService.sendMessage(imageMessage);
					}
				})
			},
			showImageFullScreen (e) {
				var imagesUrl = [e.currentTarget.dataset.url];
				uni.previewImage({
					urls: imagesUrl
				});
			},
			playVideo (e) {
				this.video.visible = true;
				this.video.url =e.currentTarget.dataset.url;
			},
			onVideoPlayStart () {
				this.video.context.requestFullScreen({
					direction : 0
				});
			},
			onVideoFullScreenChange (e) {
				//当退出全屏播放时，隐藏播放器
				if(this.video.visible && !e.detail.fullScreen){
				    this.video.visible = false;
				    this.video.context.stop();
				}
			},
			messageInputFocusin () {
				this.more.show = false;
				this.emoji.show = false
			},
			showEmoji () {
				this.emoji.show = !this.emoji.show;
				this.more.show = false;
			},
			showMore () {
				this.more.show = !this.more.show;
				this.emoji.show = false
			},
			selectEmoji (emojiKey) {
				this.content +=emojiKey
			},
			showCustomMessageForm () {
            	let to = {
            		id : this.friend.uuid,
					name : this.friend.name,
					avatar : this.friend.avatar,
					type : this.GoEasyIM.SCENE.PRIVATE
				};
				uni.navigateTo({
					url: '../customMessage/customMessage?to=' + JSON.stringify(to)
				})
			},
			scrollToBottom () {
				this.$nextTick(function(){
					uni.pageScrollTo({
						scrollTop: 2000000,
						duration : 10
					})
				})
			},
			markPrivateMessageAsRead (friendId) {
				this.im.markPrivateMessageAsRead(friendId)
						.then(() => {
							console.log('标记为已读成功')
						})
						.catch(e => {
							console.log(e)
						})
			}
		}
	}
</script>

<style >
</style>
